Free calculators for learning and classroom practice
Lightweight math tools with steps: fractions, prime factorization, GCD and LCM. Mobile-friendly, no sign-up, and completely free.
Tools
Add, subtract, multiply and divide fractions with steps.
Math basicsBreak a number into prime factors with steps and a prime check.
Math basicsFind the GCD and LCM of several numbers with steps.
Math basicsPercent of, what percent, and increase/decrease — with exact steps.
Math basicsList all divisors with count, sum, pairs, and the count formula.
Math basicsConvert length, weight, area, volume, and time units exactly, with steps.
Math basicsSolve for x with step-by-step transposition.
Why this site
Shows the steps
Not just answers — see how each result is worked out.
Mobile-friendly
Responsive design that works on phones and tablets.
Japanese & English
Every tool is available in both languages.
Study guides
How to Add and Subtract Fractions (Common Denominators Made Easy)
Adding and subtracting fractions is easy once you understand common denominators. Learn what a common denominator is, how to find one, and how to simplify — with worked examples.
What Is Prime Factorization? A Beginner's Guide
Learn what prime factorization is, how to do it step by step, and why it helps with greatest common divisors, least common multiples, and simplifying fractions.
More tools
Geometry Drawing Tool
Draw triangles, quadrilaterals, circles and more, then export to PNG or PDF. Free.
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